I was never much aware of how powerful he was until I've done more research on him more recently.
Doom embarrasses the The Avengers
Hand to Hand Skill
Doom is stranded reborn in Counter Earth without his armour. His hand to hand combat skills allow him to kill a lion
Chastises and slaps the Hulk around
Hypnotizes a Kracken
Resists Emma Frosts attempt at mind control
Intentionally challenges Purple Man to control his mind
More Feats To Come:
All Hail Doom!